Coupling for ignition-machines.



G. HONOLD.

' COUPLING FOR IGNITION mommzs. ,APYLIUATION FILED SEPT. 23, 1910.

,105,6 6 0, S S PatentedAug.4,19 14.

WITNESSES INK/EN'TU lulu nun In, mu, Inna-mu, u a

. UNITED sirntrns PnTENT OFFICE.

eoTrLoB noivonn, or srt'rrroanr, GERMANY, Asstenon To THE FIRM or Roxanna BOSCH, or srurrenn'r, GERMANY.

GOUPLIIfIG FOR IGNITION-MACHINES.

Specification OfLBttBl'S Patent.

Application filed September 23, 1910.. Serial in. 583,378.

To all whom it may concern:

Be it known that I, Gorrnon Honor, :1 subject of the Emperor of Germany, and re- 3 siding at Stuttgart, Germany, have invented certain new and useful Improvements in; Couplings for Ignition-Machinesf end I do; hereby declare the following to be a full, clear, and exact description of the invention, 1 such as will enable others skilled in-the art to which it appertains to make and 'use the same.

The invention relates to a couplingde vice for-driving electric ignition machines for combustion engines in particular. has much as these machines are usually provided with double Tarmatures, as is well known, the driving force required at the various positions of the armature is by no means constant, but varies between relatively wide limits, as a result of similar variations in the field strength. It is practically m'Z when the pole pieces of the armatureare exactly opposite those of the field magnet and 'it increases gradually up to the point preceding the position in which the magnetic lines of force through the armature core are reversed, and then it decreases very suddenly, finally reaching a negative value when the armature has rotated through 180 from its initial position. Here it again becomes practically ml and goes-through the same changes anew. If, therefore, such an armature is coupledrigidly to the driving shaft of the engine and is driven at constant speed, thenthese Widely varying forces re quire that the driving shaft be much stronger than would be required ifthe torque of the armature were constant throughout a cycle of rotation. Furthermore, with a rigid coupling it is necessary-to have accu-- rate alinement between the abuttingshafts,

I unless'some provision is made for variation and wear by allowing mechamcalplay between the coupling parts, which'procedur'e, however, results in noise, shock and 'excessive wear. .Heretofore spring cou ling de-. vices-have been used, but their exibility has been securedat the'expens'e of definite" ness of the ignition, period. The essential -features are that the flexibility secured be suificient to'provide for normal variations of alinement and wearand that the rotation of the ignition machinestill be maintained at synchronism well enough to give the de-- sired definite position to the ignition period.

.together, the ends of the 1 The invention fulfils these requirements by inter-posing between the armature of the ignition machine and the driving shaft a spring couplin of the novel, simple and compact form i lustrated in the accompanying drawings, of which A Figure 1 is a side view of the coupling, partly in section; Fig. 2 is an end view of the part c of the couplin"; Fig. 3 is an end view of the other art Z of the coupling;

1 Fig. 4 is a cross section on line 4-4 of Fig. 1.

The con-plin element 0 is fixed on the end of the shaft or (for example, the armature shaft) by meansof a wedge b, and the cut away disk sect-ion Z is fixed by a wedge '5 'upon the other shaft is (for example, the driving shaft)- The disk 0 is provided with. a nipple d, preferably of cylindrical form and made integral with the disk. The nipple cl is slotted longitudinally. and flattened oil? on both sides, and in the slot is inserted a magazine a of thin plate springs held fast in position by a bolt f. The cut away disk Z is provided with four shoul- .ders a, and a forlcshaped block 0 of fiber, vulcanite or th like, is inserted directly in each of the two cheek pieces of the part Z of the coupling. When the coupling is put Iplate spring magazine a lie in the recesses of the. other part of the coupling, and the driving force is transmitted from' shaft it to shaft a by means of the plate spring maganine e. In consequence of itsyieldnig qualities under 'load, the plate spring magazine continually rubs on theblocks 0, which, being of softer mat'erial, constitute wearing surfaces which Patented Aug. 4, 1914.

are easily replaceable when worn out by the rubbing action of the spring magazine.

In couplings of this kind it is of great practical importancethat the two coupled shafts, a. 0., the driving shaft actuated by the engine and the armature shaft of the ignition machine, should ,be brought very exactly into a definite relative position, so that the ignition occurs exactly when the curve of. electromotive force produced by .the ignition machine is nearing its maximum. A device for this purpose 1s indicated in Figs. 1 and 2, and shown more specifically in Fig, 4. One of the coupling members Z is fastened to one of the shafts 7 to becoupled, by. the wedge pin a, and the other coupling member is then carefully adjusted into the correct position by the following mechanism, In the hub of the coupling disk a cylindrical hole is bored, into which is inserted a cylindrical bolt which .ha-son one side a circular segment shaped recess at 71-, exactly fitting the cylindrical surface of the shaft, To adjust the coupling member 0 on the shaft, the bolt 19 is first placed in itscylindrical. hole With the recess in position to receive the cylindrical surface of theshaft, andthe hub of the ,.coupling member is then shoved upon the and l are then brought 'vided with a second tangential bore for the reception of a wedge 71. The shaft 0; at this place, however, is yet left round, so that its the bore for the the shafts periphthe bore, is thereupon or filing, When thereafter the Wedge b is drawn in and clamped fast, by the aid ofits nut, the coupling is fixed upon the shaft exactly in the adjusted position. This mechanism permitting the exactadjustment of the coupling device is not claimed in the present application, but

periphery projects into Wedge 1b. The portion of any projecting into removed by boring "ally between the cheek coupling part, and slnce other lnaccuraci'es {of the spring plates.

tightened. Hub 0 is.

forms the subject matter of a divisional application, Serial No. (356,493, filed by me on October 24:, 1911.

Now it is evident, from the above description, that inaccuracies in mechanical a-linenient, either vertical or horizontal, are taken care of by the coupling of my invention,

plates are free to slide radipieces of the other since the spring in alinement are compensated for by fiexure However, the spring plates are so chosen and arranged that their flexibilit does not permit undesirable variation from synchronous speed at any point of.

a cycle of rotation. Furthermore, the flexibility provided reduces somewhat the required size of the two shafts.

lVhat I claim i's:

In a shaft coupling device for ignition machines for combustion engines, two coupling parts, a magazine of spring plates clamped to one coupling part, cheek pieces rigidly fixed on the other coupling part embracing the said magazine of spring plates, and'a fork-shaped block of relatively soft Wearing material set in said check pieces: substantially as described.

' In testimony whereof I a'li'iX my signature,

in presence of two witnesses.

GOTTLOB HONOLD.

Witnesses MAX Anscnbtrz, REINHOLD ELWERT. 

